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Correlation analysis between the jet exhaust velocity field and microphone-array acoustic measurements for a turbo-fan engine

机译:涡轮风扇发动机射流速度场与麦克风阵列声学测量之间的相关性分析

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Simultaneous flow and acoustic measurements have been acquired for an aircraft, during ground operation. Measurements of velocity field data with stereoscopic particle image ve-locimetry (SPIV) on the engine-exhaust jet are correlated with the acoustic-pressure signals of a 120 microphone linear array. The turbulent velocity and the applied-stress components of the Lighthill- and Lilley-analogy source terms in the SPIV region are correlated with the microphone array. Convection effects on the propagating sound waves are neglected in the present study. The self-noise term in the Lighthill quadrupole, shows a hot spot for the correlation in the by-pass to ambient shear layer. This high correlation region is clearly visible in one of the analysed test points only, while in general a poor statistical convergence seems to affect the test-source correlation.
机译:在地面运行期间,飞机已获得了同时的流量和声学测量值。使用发动机排气口上的立体粒子图像速度(SPIV)对速度场数据进行的测量与120麦克风线性阵列的声压信号相关。 SPIV区域中的Lighthill-和Lilley-analogy源项的湍流速度和施加的应力分量与麦克风阵列相关。对流对传播声波的影响在本研究中被忽略。 Lighthill四极杆中的自噪声项显示了旁路与环境剪切层之间相关性的热点。这个高相关区域仅在其中一个分析的测试点中清晰可见,而一般而言,不良的统计收敛似乎会影响测试源的相关性。

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